Drilling mechanism



Oct. 14, 1941. F. MILLER DRILLING MECHANISM Filed March 23, 1940 w n maM N E4 w a M Y B H 5 E 9 7 7 [Hum IWNJQ 7 5 t 9 1 5 L a W i u 1 1 I h M05 M0 7 a u 5 MW 3 u 75L! v ll, 1 r 2 5 3 HIS ATTORNEY- Patented Oct. 14,1941 DRILLING MECHANISM W Frank Miller, East, )rang'e, N. J., assignoito Ingersoll-Rand Company, New York, N. Y., a corporation of New JerseyApplication March 23,1940, SerialNof325A85 I This invention relates to arotary drilling apparatus, and more particularly, it relates-rtoadrilling apparatus-of the type employed in drillreg-wens, and [the like,;whichform removable earthen. cores by cutting annular channelsthereabou'tl ln the. operation of such. devices it is desirable toconstantly-present a highlyabrasive cutting surface tothework'and tothis end shot is constantly introduced into the hole while it is beingdrilled. Heretofore, the means employed forjntroducingthe shot has-been;complicated and; in-thenatureof an accessory that-had to be applied tothe drill and. used insuch a manner that itv did not pass through orinterfere with the'drilloperating mechanism. l i .It is, accordingly, anobject of the-present inverition' toflprovide a shojtjfeedi'ng mechanismwhi'chis integral withjthe drilling apparatus.

.An'OtheIf objectis to provide a drill shot feed'. ing mechanism whichextends through moving parts of the drill.

pact and efiicientdrill shot feeding irnechanism;

Theseand other objects will be in 'part ob vious and in part pointed outin the following specification of which the drawing forms a part and inwhich similar reference numerals refer to similar parts. I

Figure 1 is a View in section of a drilling apparatus constructed andarranged in accordance It is a'fu-rther object to provide a simple,coniwith the principles of the present invention, and

Figure 2 is a transverse view taken along line 22 of Fig. 1;

With reference to Fig. 1, a rotary drilling apparatus constructed inaccordance with the principles of the present invention is generallyindicated at I and consists of a drill or cuttingtool 3 having a seriesof slots 5 (two of which are shown in dotted lines in Fig. l) to definethe cutting teeth in the tool 3. Uponrotation of the tool 3 the cuttingteeth out an annular kerf l in the earth formation severing the core 9therefrom in order that'it may be removed to form a hole defined by thewall H. Within the tool 3 .is a transverse plate is rigidly securedthereto and below the transverse plate is abafiie plate l5 held inposition by the bolts I! extending through both of the plates.

The transverse plate I3 is provided with a port [9 opening into thehollow shaft, or stem, 2|. The plate l3 and shaft 2| are fastenedtogether by the flange coupling 23 which is se-,- cured on thetransverse plate 13 by bolts 25 and is provided with threads 2'! toengage complementary threads provided on the shaft 2| Likewise, .the.upperend of theflshaft 2L hasv threads ZSI-by means of which theconnector,-. or space. piece, 31 may. be secured thereto." The lowerwall of. the connector has .a. bore 3$,.th e{ purpose of which will :beexplained hereinafter, and a larger bore 35in itsupper wall. A thread-'ed=flange3l is bolted to the upper wall. of the. connector 3! and isadapted tov be threadedlysecured to the sleeve 39 formed on the drivengear ll of 1a...reduction gearing, generally indi cated at 43. Thereduction gearing 43 forms a part of. thedriving' mechanism and locatedwithin the. base-4 5 on which rests the driving motor..

The entire driving mechanism consisting of the motor Qt, the base landthe gearing 43: is-enclosed. thescasing 49. .This' casing isfadapted tobe. raised .or loweredin the hole being drilled by the stefnj5l,detachably secured by the studs. 53 to the'wall 55 whichr'forms a.part'of thecasing 49; The lower wallf5'l1of the "casing ll has a sleeve59throughwhich passes thegear sleeve 39 and. betweenwhich is placedthebushing 6!. Abe'arin'g 63 reist's'onthe upper surface of the sleeve59 .and "supportsi the jdriv'en' gear M. ,It

willbe noted" that the passage 65, through'the 1 The partition wall 69has a central opening in which is placed the bushing I1, serving toguide the motor shaft 6'! and, likewise, the wall H has the bushing I9.Between the walls 69 and II the driver gear 81 is keyed to the motorshaft 61 and drives the follower gears 83 and 85 which are fastenedrespectively to the gear shafts 13 and 15. Below wall H and within theinternal driven gear M and arranged so as to intermesh therewith are thefollower gears 81 and 89; the follower gear 81 being securely fastenedto the shaft 13, and gear 89'to the shaft 15.

With this. arrangement it is apparent that, when the motor 41 rotatesthe shaft 61, the driver gear 8| will also rotate and, since it is inmesh,

tubular and, consequently, has a passage 9| extending through its entirelength. Through this passage and spaced therefrom, is the shot feedingconduit, or tube, 93. This conduit is formed with an enlarged portion 95designed to extend through an opening 91 centrally located in the upperwall 99 of the casing 49. In order that the conduit 93 may revolve withrespect to the casing 49, which is held against rotation, the portion 95is journalled in the bearing IOI, resting on the upper wall 99 of thecasing.

The portion 95 of the conduit 93 is arranged to receive the pipe I03which forms a part of the shot supply means. A bushin I02, surroundingpipe I03 holds the packing I04 against the portion 95 of the conduit 93.The pipe I03 is connected by elbow I05 and pipe [01 to a valve I09through which shot may be introduced into the pipe. Adjacent the valveI09 and interposed in the pipe I01 is a valve III through which watermay be introduced if it is desired. The lower end of the conduit 93extends into the shaft 2| and passes through the bore 33. A stuflingbox, consisting of the bushing H3 and packing II5, rests in the recessII'I formed in the connector just above the bore 33. This stuffing boxprevents any passage of material between bore 33 and the conduit 93.When the motor 41 is driving the tool 3, as previously explained, thespeed of the motor will naturally be much greater than the speed of thedrill and, by spacing the conduit 93 from the shaft 61, the conduit 93may remain substantially stationary. Of course, if desired, the conduit93 and pipe I03 may be one continuous pipe and then there would be nonecessity for bearing 95, since conduit 93 would then always bestationary. If, however, conduit 93 should be rotated, due to thefriction between the conduit 93 and the stufiing box, the speed ofrotation of the two would only be equal to the speed of rotation of thedrill which would not, in any way, hinder the passage of shot throughthe conduit 93.

When it is desired to employ the shot, it may be introduced through thevalve I09 with or without water supplied through valve III. The

shot introduced through the pipe I01 will fall by gravity through pipe I03 into the conduit 93 and, after leaving conduit 93, will pass throughthe shaft 2| and the port I9 to strike the baiile plate I5. The baffleplate I5 serves to deflect the shot from the core 9 and let it drop tothe cutting tool formed on the drill 3 in order that the cutting teethmay be kept clean. In order to remove the cuttings it will be necessaryto introduce water with the shot so that the cuttings may be carriedupwardly from the cutting teeth by the water through the space betweenthe wall II and the cutting tool 3 and be deposited on the transverseplate I3.

This construction, therefore, lends itself to a simple but efficientmethod of introducing shot to the cutter tool of a rotary drill and,although a preferred embodiment of the invention has been illustratedand described, it is not to be limited save as defined in the appendedclaims.

I claim:

1. In a rotary drilling apparatus, a casing, a. driving motor in thecasing having a shaft, a series of reduction gears in the casing adaptedto be driven by the motor, a sleeve on one of the reduction gears, aconnector secured to the sleeve, a cutter element secured on theconnector, a stuffing box in the connector, a tube extending, throughthe motor and reduction gears and stufling box terminating adjacent thecutter to supply shot thereto.

2. In a rotary drilling apparatus, a casing, a driving motor in thecasing, a series of reduction gears in the casing, a shaft to enable themotor to drive the gears, a sleeve on one of said gears extendingthrough the casing, a bearing on the casing for the sleeve, a connectorsecured to the sleeve, a stufling box in the connector, a hollow shaftsecured on the connector, a rotary cutting tool on the shaft, a conduitextending through the motor shaft and terminating in the hollow shaft,and a pipe through the casing opening into the conduit to supply shotthrough the conduit to FRANK MILLER.

